In the back titration of insoluble metal carbonates with standard nitric acid and sodium hydroxide solution, why are dilute HCl and H2SO4 are not suitable?
Corrie writes … HCl and H2SO4 are not used because the metal involved may form an insoluble chloride (e.g. Ag+ ) or sulphate (e.g. Pb2+). As all nitrates are soluble, all metal carbonates should dissolve in excess dilute nitric acid, the remaining nitric acid then determined by back titration with NaOH. Risk assessment Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide appropriate control measures to reduce the risks. You must have these approved by those in authority in your school or college laboratory. Do not rely on what is said on this website. For further guidance see our tutorial on Risk Assessment.
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